The biggest resident theater company in North America is not to be found in New York City, Los Angeles or Chicago. Nor, as stage cognoscenti might suppose, is it in a thriving regional center like Minneapolis, home of the Guthrie, or a festival city like Ashland, site of the Oregon Shakespearean Festival. The champion -- as measured cumulatively by number of productions and performances, size of troupe, total audience and budget -- is located in an unpretentious town in the Canadian province of Ontario, about 90 miles from the skyscrapers of Toronto. It is a place that began with scarcely any...

